I have a 2009 civic and A/C pressure was 20 PSI. I put in 1.5 pounds (2 -12 oz. cans) of R134a and the pressure went up to 30 PSI. The air temp. coming out of the ducts inside the car is the same....
not cold but barely cool. The compressor is working a comes off and on like it should (I hope). Is there a filter for the A/C system? I would appreciate your comments and help. Thank you so much.

 

In case you have not already checked - take a look at the front of the car where the radiator and condenser live - look for any debris that might be choking off airflow over the condenser cooling fins - I have also seen cars with fins missing or corroded off the condenser tubes - your car is prolly to new for that unless you live by the beach... there could be a bunch of other reasons why it's not cooling - but this one is cheap and easy to check.

 

The vehicle only calls for 400kg to 450kg which is just shy of 1 pound. This could cause an issue with the system, prior to adding refrigerant it could be possible it is leaking. Did you add a dye when you added refrigerant to the system?